Merge remote-tracking branch 'origin/master' into shim-webcrypto

frontend/src/download.js

@@ -44,6 +44,9 @@ $(document).ready(function() {
       });
       $('#download-btn').click(download);
       function download() {
+        // Disable the download button to avoid accidental double clicks.
+        $('#download-btn').attr('disabled', 'disabled');
+        
         storage.totalDownloads += 1;
 
         const fileReceiver = new FileReceiver();